They can be.
A community can be a closely-knit neighbourhood, a village, a tribe (i.e. an extremely large family), or (as in the case of the JW) a closely-knit church. A group of people with shared interests and values who meet regularly and regard each other as extended family.
It's an alien concept to Westerners in the 21st Century (especially the 90% of us who live in big cities) since our culture has, for various reasons, migrated to the polar opposite of community. Study after study shows we're distant, disconnected, lonely people. We jump from place to place. We don't know or spend time with the people around us. We absorb ourselves in work and personal entertainment. When we do tend to socialize, it's either on social media--which every study ever conducted concludes increases anxiety, depression, and feelings of isolation--or occurs in superficial ways, like getting drunk, gambling, etc.
Closely-knit communities are rare in North America. The few there are tend to appear in small towns, ethnic ghettos that haven't assimilated to North American culture, and occasionally in places where individuals have invested a tremendous amount of effort specifically to build family-like communities, such as the Amish or the JW church. Our miserable, isolated Western world loves to point out the specks in these communities' eyes (particularly the most egregious offenses) whilst ignoring the massive, Sequoia-sized plank jutting out of its own eye, but I've noticed things have gotten so bad in recent years there are growing attempts to establish new communities from all points on the political spectrum. You might say the JW's have been "on to something" in their relatively brief existence as a church.
The government in the JW church is hierarchical. There are senior ministers at the top, followed by junior ministers, deacons, elders, senior members, and finally junior members. Not everyone who attends the church is a member. The JWC may have one or two administrative levels in addition to these; I don't know exactly. If it deeply interests you, I'm sure you can find all the details on their websites.